diff --git a/frontend/src/styles/tokens.css b/frontend/src/styles/tokens.css
index bc8a542..cbd142b 100644
--- a/frontend/src/styles/tokens.css
+++ b/frontend/src/styles/tokens.css
@@ -40,4 +40,17 @@
   --color-table-row-fg: #000000;
   --color-table-header-bg: #f5f5f5;
   --color-table-header-fg: rgba(0, 0, 0, 0.85);  /* = #000000D9 */
+
+  /* === 3. Prototype shell tokens === */
+  --color-topbar-bg: #1f1f23;
+  --color-toolbar-bg: #2c2f36;
+  --color-toolbar-text: #e6e7ea;
+  --color-tab-active: #1e84e6;
+  --color-tab-text: #9aa0a8;
+  --color-field-bg-edit: #eaf3fe;
+  --color-field-label-req: #f04848;
+  --color-table-border: #e3e6eb;
+  --color-table-row-alt: #f7f8fa;
+  --color-filterbar-bg: #ffffff;
+  --color-nav-overlay-bg: #2b3137;
 }